Example usage for java.lang System arraycopy

Introduction

In this page you can find the example usage for java.lang System arraycopy.

Prototype

@HotSpotIntrinsicCandidate
public static native void arraycopy(Object src, int srcPos, Object dest, int destPos, int length);

Source Link

Document

Copies an array from the specified source array, beginning at the specified position, to the specified position of the destination array.

Usage

From source file:Main.java

public static void main(String[] argv) throws Exception {
    int[] array = { 1, 2, 3 };
    Object newArray = Array.newInstance(array.getClass().getComponentType(), Array.getLength(array) * 2);
    System.arraycopy(array, 0, newArray, 0, Array.getLength(array));

}

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From source file:MainClass.java

public static void main(String args[]) {
    int array1[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
    int array2[] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
    System.arraycopy(array1, 0, array2, 0, 5);
    System.out.print("array2: ");
    System.out.print(array2[0] + " ");
    System.out.print(array2[1] + " ");
    System.out.print(array2[2] + " ");
    System.out.print(array2[3] + " ");
    System.out.print(array2[4] + " ");
    System.out.print(array2[5] + " ");
    System.out.print(array2[6] + " ");
    System.out.print(array2[7] + " ");
    System.out.print(array2[8] + " ");
    System.out.println(array2[9]);
}

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From source file:ACDemo.java

public static void main(String args[]) {
    System.out.println("a = " + new String(a));
    System.out.println("b = " + new String(b));
    System.arraycopy(a, 0, b, 0, a.length);
    System.out.println("a = " + new String(a));
    System.out.println("b = " + new String(b));
    System.arraycopy(a, 0, a, 1, a.length - 1);
    System.arraycopy(b, 1, b, 0, b.length - 1);
    System.out.println("a = " + new String(a));
    System.out.println("b = " + new String(b));
}

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From source file:Main.java

public static void main(String[] argv) {

    String[] oldArray = new String[] { "a", "b", "c", "d" };

    int index = Arrays.binarySearch(oldArray, "e");
    if (index < 0) {
        int insertIndex = -index - 1;

        String[] newArray = new String[oldArray.length + 1];
        System.arraycopy(oldArray, 0, newArray, 0, insertIndex);
        System.arraycopy(oldArray, insertIndex, newArray, insertIndex + 1, oldArray.length - insertIndex);
        newArray[insertIndex] = "e";
        oldArray = newArray;//  w w  w . j  a v  a2  s. c  o m
    }
}

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From source file:GetURL.java

public static void main(String args[]) throws Exception {
    URL url = new URL("http://www.google.com");
    InputStream urlstream = url.openStream();
    byte[] buffer = new byte[0];
    byte[] chunk = new byte[4096];
    int count;/*ww w.  j a v a 2 s . co m*/

    while ((count = urlstream.read(chunk)) >= 0) {
        byte[] t = new byte[buffer.length + count];
        System.arraycopy(buffer, 0, t, 0, buffer.length);
        System.arraycopy(chunk, 0, t, buffer.length, count);
        buffer = t;
    }

    String filename = (url.getFile()).replace('/', File.separatorChar);
    File f1 = new File(filename);
    filename = f1.getName();
    FileOutputStream f = null;
    f = new FileOutputStream(filename);
    f.write(buffer);
    f.close();
}

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From source file:fuse.okuyamafs.OkuyamaFuse.java

public static void main(String[] args) {

    String fuseArgs[] = new String[args.length - 1];
    System.arraycopy(args, 0, fuseArgs, 0, fuseArgs.length);

    ImdstDefine.valueCompresserLevel = 9;
    try {/*w w  w  . j  a  va  2  s.co m*/
        String okuyamaStr = args[args.length - 1];

        // Raid0?????????
        if (okuyamaStr.indexOf("#") != -1) {
            stripingDataBlock = true;
            okuyamaStr = okuyamaStr.substring(0, (okuyamaStr.length() - 1));
        }

        String[] masterNodeInfos = null;
        if (okuyamaStr.indexOf(",") != -1) {
            masterNodeInfos = okuyamaStr.split(",");
        } else {
            masterNodeInfos = (okuyamaStr + "," + okuyamaStr).split(",");
        }
        // 1=Memory
        // 2=okuyama
        // 3=LocalCacheOkuyama

        String[] optionParams = { "2", "true" };
        String fsystemMode = optionParams[0].trim();
        boolean singleFlg = new Boolean(optionParams[1].trim()).booleanValue();

        OkuyamaFilesystem.storageType = new Integer(fsystemMode).intValue();
        if (OkuyamaFilesystem.storageType == 1)
            OkuyamaFilesystem.blockSize = OkuyamaFilesystem.blockSize;

        CoreMapFactory.init(new Integer(fsystemMode.trim()).intValue(), masterNodeInfos, stripingDataBlock);
        FilesystemCheckDaemon loopDaemon = new FilesystemCheckDaemon(1, fuseArgs[fuseArgs.length - 1]);
        loopDaemon.start();

        if (OkuyamaFilesystem.storageType == 2) {
            FilesystemCheckDaemon bufferCheckDaemon = new FilesystemCheckDaemon(2, null);
            bufferCheckDaemon.start();
        }

        Runtime.getRuntime().addShutdownHook(new JVMShutdownSequence());
        FuseMount.mount(fuseArgs, new OkuyamaFilesystem(fsystemMode, singleFlg), log);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

---

From source file:DataStudioCrak.java

public static void main(String[] args) {
    String company = "labthink";
    byte[] companyByteArray = company.getBytes();
    byte[] companyByteIntArray = intToByteArray(compute(companyByteArray, companyByteArray.length));
    // byte[] ff = "zhulixia".getBytes();
    byte[] snByte = new byte[32];
    byte[] byte1 = new byte[] { 7, 1 };
    byte[] byte2 = "zhaodapengpojiehahahahahaha".getBytes();
    byte[] byte3 = new byte[] { 127 };
    byte[] snMain = new byte[24];
    System.arraycopy(byte1, 0, snMain, 0, 2);
    System.arraycopy(byte2, 0, snMain, 2, 17);
    System.arraycopy(companyByteIntArray, 0, snMain, 19, 4);
    System.arraycopy(byte3, 0, snMain, 23, 1);
    //  1 - single license,2 - site license ,3 educational license
    snMain[2] = (byte) 1;
    int intSn = compute(snMain, snMain.length);
    System.out.println("intSn=" + intSn);
    byte[] key1 = "dddd".getBytes();
    byte[] key2 = intToByteArray(intSn);
    byte[] key = new byte[8];
    System.arraycopy(key1, 0, key, 0, 4);
    System.arraycopy(key2, 0, key, 4, 4);

    byte encodedSnMain[] = new byte[snMain.length];
    try {/*from   w  ww  . j  a v a  2 s .c  om*/
        DESKeySpec deskeyspec = new DESKeySpec(key);
        javax.crypto.SecretKey secretkey = SecretKeyFactory.getInstance("DES").generateSecret(deskeyspec);
        Cipher cipher = Cipher.getInstance("DES/ECB/NoPadding");
        cipher.init(Cipher.ENCRYPT_MODE, secretkey);
        cipher.update(snMain, 0, snMain.length, encodedSnMain);
        cipher.doFinal();
    } catch (Exception ex) {
        ex.printStackTrace();
    }
    System.arraycopy(key1, 0, snByte, 0, 4);
    System.arraycopy(key2, 0, snByte, 28, 4);
    System.arraycopy(encodedSnMain, 0, snByte, 4, 24);
    char[] snCharArray = Hex.encodeHex(snByte);
    String sn = new String(snCharArray);
    System.out.println("sn=" + sn);
}

---

From source file:VectorBenchmark1.java

public static void main(String[] args) {
    Vector v = new Vector();

    long start = System.currentTimeMillis();
    for (int i = 0; i < MaxSize; i++)
        v.add(new Integer(i));
    long end = System.currentTimeMillis();
    System.out.println("Allocating vector elements: " + (end - start) + " milliseconds");

    Integer[] integerArray = new Integer[1];
    start = System.currentTimeMillis();
    for (int i = 0; i < MaxSize; i++) {
        if (i >= integerArray.length) {
            Integer[] b = new Integer[i * 2];
            System.arraycopy(integerArray, 0, b, 0, integerArray.length);
            integerArray = b;/*from   w  w w . j av a2  s.co m*/
        }
        integerArray[i] = new Integer(i);
    }
    end = System.currentTimeMillis();
    System.out.println("Allocating array elements:  " + (end - start) + " milliseconds");

    start = System.currentTimeMillis();
    for (int j = 0; j < NTRIES; j++)
        for (int i = 0; i < MaxSize; i++) {
            Integer r = (Integer) v.get(i);
            v.set(i, new Integer(r.intValue() + 1));
        }
    end = System.currentTimeMillis();
    System.out.println("Accessing vector elements:  " + (end - start) + " milliseconds");

    start = System.currentTimeMillis();
    for (int j = 0; j < NTRIES; j++)
        for (int i = 0; i < MaxSize; i++) {
            Integer r = integerArray[i];
            integerArray[i] = new Integer(r.intValue() + 1);
        }
    end = System.currentTimeMillis();
    System.out.println("Accessing array elements:   " + (end - start) + " milliseconds");
}

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From source file:net.labthink.run.DataStudioCrak.java

public static void main(String[] args) {
    String company = "Labthink";
    byte[] companyByteArray = company.getBytes();
    byte[] companyByteIntArray = intToByteArray(compute(companyByteArray, companyByteArray.length));
    // byte[] ff = "zhulixia".getBytes();
    byte[] snByte = new byte[32];
    byte[] byte1 = new byte[] { 7, 1 };
    byte[] byte2 = "zhaodapengpojiehahahahahaha".getBytes();
    byte[] byte3 = new byte[] { 127 };
    byte[] snMain = new byte[24];
    System.arraycopy(byte1, 0, snMain, 0, 2);
    System.arraycopy(byte2, 0, snMain, 2, 17);
    System.arraycopy(companyByteIntArray, 0, snMain, 19, 4);
    System.arraycopy(byte3, 0, snMain, 23, 1);
    //  1 - single license,2 - site license ,3 educational license
    snMain[2] = (byte) 1;
    int intSn = compute(snMain, snMain.length);
    System.out.println("intSn=" + intSn);
    byte[] key1 = "dddd".getBytes();
    byte[] key2 = intToByteArray(intSn);
    byte[] key = new byte[8];
    System.arraycopy(key1, 0, key, 0, 4);
    System.arraycopy(key2, 0, key, 4, 4);

    byte encodedSnMain[] = new byte[snMain.length];
    try {//from w  w w.  ja v a 2s .c  o  m
        DESKeySpec deskeyspec = new DESKeySpec(key);
        javax.crypto.SecretKey secretkey = SecretKeyFactory.getInstance("DES").generateSecret(deskeyspec);
        Cipher cipher = Cipher.getInstance("DES/ECB/NoPadding");
        cipher.init(Cipher.ENCRYPT_MODE, secretkey);
        cipher.update(snMain, 0, snMain.length, encodedSnMain);
        cipher.doFinal();
    } catch (Exception ex) {
        ex.printStackTrace();
    }
    System.arraycopy(key1, 0, snByte, 0, 4);
    System.arraycopy(key2, 0, snByte, 28, 4);
    System.arraycopy(encodedSnMain, 0, snByte, 4, 24);
    char[] snCharArray = Hex.encodeHex(snByte);
    String sn = new String(snCharArray);
    System.out.println("sn=" + sn);
}

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From source file:J2METimeServer.java

public static void main(String[] args) {

    try {//from ww  w. j a  v a  2 s  . c  o m
        Calendar cal = Calendar.getInstance();
        DatagramConnection receiver = (DatagramConnection) Connector.open("datagram://");
        byte[] buffer = new byte[256];
        Datagram dgram = receiver.newDatagram(buffer, buffer.length);
        for (;;) {
            dgram.setLength(buffer.length);
            receiver.receive(dgram);
            cal.setTime(new Date());
            String time = cal.toString();
            byte[] dataBytes = time.getBytes();
            System.arraycopy(dataBytes, 0, buffer, 0, dataBytes.length);
            dgram.setLength(dataBytes.length);
            receiver.send(dgram);
        }
    } catch (IOException ex) {
        System.out.println("IOException: " + ex);
    }
}

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